The intervention will be the use of an Autoadjusting CPAP unit that will be applied to the subject during the 8 hours overnight the first night after surgery (study night). During this time, they will undergo a full night attended polysomnogram in their hospital room.

Device: Autoadjusting CPAP (VPAP Auto)

An autoadjusting CPAP unit is used in place of subject's own CPAP unit during the night of the polysomnography study (the first night after surgery).

Other Name: VPAP Auto

Active Comparator: CPAP arm (usual care)

The intervention will be the use of the subject's own CPAP machine and this will be applied to the subject during the 8 hours overnight the first after surgery (study night). During the study night, they will undergo full polysomnography in their hospital room.

Device: CPAP

Subject's own CPAP unit is applied to the subject during the polysomnography study night (the first night after surgery)

Detailed Description:

The purpose of this study is to determine if an Autoadjusting CPAP machine is better than the regular CPAP machine in treatment of Obstructive Sleep Apnea in the postoperative setting.

Patients with known Obstructive Sleep Apnea who are on CPAP therapy at home and undergo an elective surgery (meeting specified inclusion and exclusion criteria) will be randomized to either using Autoadjusting CPAP vs their usual CPAP at their prescribed settings the night after surgery. During that night, they will be monitored with full polysomnography in their hospital bed.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT00588848